[xsl] Looking Not Working for No Obvious Reason

["Eliot Kimber" <ekimber@xxxxxxxxxxxxxxxxxxx>]

Within my style sheet I need to be able to map between pairs of strings 
(in this case, long and short titles).

I've tried to implement this by using an internal document-node() 
variable that defines the mapping and then using a function to do 
lookups against the map.

The map looks like this (declared as a stylesheet-scope variable):

  <xsl:variable name="sectionTitleMap" as="document-node()">
    <xsl:document>
    <map>
      <item>
        <shorttitle>Background</shorttitle>
        <longtitle>Overview and Background</longtitle>
      </item>
      <item>
        <shorttitle>Scope</shorttitle>
        <longtitle>Scope and Scope Exceptions</longtitle>
      </item>
      <item>
        <shorttitle>Glossary</shorttitle>
        <longtitle>Topical Definitions - Glossary</longtitle>
      </item>
     </map>
   </xsl:document>
  <xsl:variable>

I then have this function to do lookups:

  <xsl:function
    name="func:getShortTitleForSection" as="xs:string">
    <xsl:param
      as="xs:string"
      name="sectionBaseTitle"/>
    <xsl:choose>
      <xsl:when test="count($sectionTitleMap//longtitle[. = 
$sectionBaseTitle]) = 1">
        <xsl:sequence select="$sectionTitleMap//item[longtitle[. = 
$sectionBaseTitle]]/shorttitle"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:sequence select="$sectionBaseTitle"/>
      </xsl:otherwise>
    </xsl:choose>

  </xsl:function>


As far as I can see this should just work, assuming my input parameter 
occurs in the table.

However, what I'm getting is that this works as expected for *some* 
input strings but not for others, where I've verified that the input 
strings match the values in the map.

I must be doing something wrong but I can't figure out what it might 
be--the fact that some input values work and others don't is odd.

Anyone have any idea what might be going wrong or what I can do to track 
down the bug? I've done things like copied a mapping target from my 
input document into the map just to be 100% sure the string is the same, 
but I still get the failure, so it doesn't appear to be something subtle 
like invisible characters in the input or some such (which I wouldn't 
expect in this case, but you never know).

The real mapping is small enough I could rewrite the code to use 
choose/when for the mappings but this seemed like the most efficient way 
to do a two-way mapping in XSLT.

Thanks,

Eliot

--
W. Eliot Kimber
Professional Services
Innodata Isogen
8500 N. Mopac, Suite 402
Austin, TX 78759
(214) 954-5198

ekimber@xxxxxxxxxxxxxxxxxxx
www.innodata-isogen.com